Motor-valve-tester check valve



March 10, 1931. J L m 1,795,333 MOTOR VALVE TESTER CHECK VALVE FiledMarch 29, 1927 Patented Mar. 10, 1931 i i UNITED. STATE PA QFFICE JAREDBARTON FLEMIN or BAL'riMortE COUNTY, MARYLAND, ASSIGNOR TO THE BLACK &DECKER MANUFACTURING COMPANY, OF TQWSON, MARYLAND, A COR- PORA'IION or"MARYLA D vMo'ro1a-vALvia-Tasman, "CHECK VAL E Applica'tionfiled March29, 1927; Serial No. 179,222.

The invention relates to a check valve lustrated a valve testingapparatus for the for use with low pressures and-particularly adaptedfor use in connection with apparatus for testing the intake and exhaustvalves of internal combustion motors. This type of apparatusisusedtotest or-indicate-the degree of perfection of the contact of motor valveswith the seats in connection with the grindingoperation, principally forthe purpose of showing when 'a satisfactory closure of the valvesisachieved. Forthis purpose fluid pressure, most convenientlyairpressure, is built up'in' a cup or othercap or closurewhich contacts;with the cylinder surface surrounding the-valve. seat forming a chamberaround the valve seat which ispractically air-tight and-from which'alr'can only escape aroundthe valve d st imperfpection I "'of'the fit. p

The low pressure valves previously used in this connection have beenexpensive on account of the necessity for accurate machining and'inorder to attainthe degree of sensitiveness required theywere-madeadjustchamber 1 adapted to encircle the valve seat 20f an internalcombustion motor, or pump, or the like, having .a poppet valve the cupable as to the pressure at which they operate an d were consequentlysubject 'to maladj ust ment in the hands of the average garage mechanic.j Y The improved form of valve may becompletely assembled within 'a Isingle fitting or connection whichvn'ray lie-referred to as 'a nipple,the entire assembly being then screwed into the body of the apparatuswhich, in the present instance, is avvalve testing cup.

In the preferred construction of the improved valve the moving memberwhich closes the valve seat, termed the valve-proper, 'is in the formofa disk which may be of an area considerably greater than the crosssectional area of thelpassage to'be closed and it is retained on itsseat by a spring member or check valve retainer, which is In theaccompanying drawings I have il- 'of' the invention-in the preferredform.

In the drawings j v ,Figure l is a top plan view of the valve testingapparatus.

Figure Q'is a vertical central section taken through the axis of thesame, the valve testing apparatus being shown in connection with afragment ofmotor cylinder including a valve,

valve seat andpassagen FigureB is a longitudinal section taken throughthe tester valve and valve chamber and fitting on the line of the axis.

Figure t is an elevation looking at the same in the direction of theaxis and particularly from the left in Figure 3.

Referring to; the drawings by numerals,

each ,of which is used to indicate the same or similar parts in thedifferent figures, the apparatus, as shown, comprises a testing cup orbeing provided with a projecting packing ring or gasket 3 around theopening or mouth, which packmg, the cylinder head being re- Hmoved,contacts the topsurface 4 of the cylinder.

In the preferred form an air pressure gauge 6 for indicating lowpressures is connected to the inside of the cup, the same beingpreferably turned upward so as to be convenient for reading by theworkman; Air pressure is built up within the cup in operation by means,of'a low pressure airpump, the most easily and conveniently operabletype of pump being the bulb pump shown at 7, which can be controlled andoperated by one hand, the other hand being used to hold the'testing cupin position. l f

The bulb pump is provided with a flexible connection 8 to a fitting 9which may have a barbednipple-lO atoneend for connection to the "tube, ahollow threaded projection 12 at the other end and an intermediateangular portion or nut 14, The threaded projection 12 enters and engagesa suitable threaded opening 15 leading through the wall of the cup 1into the chamber 16 Within the cup.

The bulb pump 7 is provided at the end remote from the tube 8 with anair admission or intake pasage 1? controlled by the non-return valveshown in the form of a ball valve 18 confined to its seat 19 by a cage20 of any suitable type. The bulb also preferably has at its deliveryend a check valve 23 opening in the same direction.

The pumping apparatus includes a check valve indicated in a general wayby reference character 21, which serves to hold the pressure in the cupwhile the bulb is expanding, taking in a new charge of air through theintake passage 17. This check valve is located in the check valvechamber 22 formed in the ei'ilarged threaded end 12 of the fitting 9.This chamber 22 is provided at the inner side with a valve seat 24csurrounding the end of the air passage 25 which extends through thefitting 9 in the direction of the axis thereof. Cooperating with thisseat is a disk 26 of a diameter a little less than theinside diameter ofthe chamber 22.

This disk is held in contact with the seat 24 by a spring wire valveretainer 27, the same comprising a loop 28 which is sprung into anannular groove 29 in the chamber 22 near the mouth or large openingthereof. In addition to the loop the valve retainer comprises a presseror contact member 30 which, in the preferred form shown, consists of thetwo ends of the wire loop, the same projecting on an incline backwardfrom the plane of the loop for a distance somewhat less than thediameter of the loop, whereby in the assembled position of the retainerthey are brought in contact with the valve disk 26 on the seat 24: atapoint 31 spaced slightly inward from the edge of the disk. The diskbeing preferably rubber, neither of the fully vulcanized hard rigidquality nor of extreme flexibility, but of the material known as rubberdam, possesses resiliency just to asulficient degree to permit it toswing inwardly, with or without a slight yielding of the spring,admitting air at pressures easily generated by the bulb pump at eachstroke or contraction of the same. The valve then returns to its seatclosing the passage when the pres sure on the bulb pump is released,permitting it to expand and perform the intake stroke. The tendency ofthe air in the cup to escape and return through the passage to the bulbpump on each intake or expansion stroke may assist in the return of thevalve to the seat. It will be further noted that the passage 25 isenlarged at 32 adjacent the valve seat increasing the cross sectionalarea of the passage and hence the'total thrust applied to the Valve bythe air pressure generatecl by the pump.

The low pressure valve thus described is groove so that there need be nofitting of P the clip. Further, the rubber disk requires no accuratefitting either to the diameter of the chamber 22 or to the valve seat,which latter it engages closely due to the back pressure of the airwithout necessity for accurate finishing of the valve seat, the valvebeing of soft material dispenses with the necessity for finishing bothmembers, which is a feature of all metallic valves. Also, the valve iseasily assembled within the fitting 9 separately from the apparatus, andis assembled with the apparatus by merely screwing the threaded portion12 into threaded opening 15, the

tubular hose 8 being then attached by forcing. it over the barbed nipple10. The advan-,. tages in disassembling for replacements andreassembl-ing are easily appreciated.

The valve thus constructed not only admits of cheap product-ion, but itis extremely efficient in its operation at low pressures.

I have thus described specifically and in detail an apparatus embodyingthe features of my invention in the preferred form in order that thenature and operation of the same may be clearly understood, however,the; specific terms herein are used descriptively rather thanjin alimiting sense, the scope of the invention being defined in the claims.

What I claim as new and desire to secure by Letters Patent is: 4

1.- A low pressure check valve construction particularly adapted for usewith a bulb or other pump comprising a valve retainer in the form of aspring loop, a valve chamber,

in the walls of which the loop is seated so as to encirclethe chamber, avalve seat, a valve disk cooperating with the seat, the spring havingresilient portions integral with the loop projecting from the loopbearing against the disk near one edge, pressing it against the seat,the otheredge being free.

2. A low pressure check valve construction particularly adapted for usewith a bulb or other pump comprising a valve retainer in the form of aloop having integral therewith, a pressure applying arm, an annularlygrooved valve chamber having a valve seat, a valve disk cooperating withthe seat, the

loop fitting in the groove and the aforesaid pressure applying armbearing against the: disk-near one edge and holding said edge in contactwith the seat.

3. A low pressure check valve construction particularly adapted for usewith a bulb o-r otherpump com-prising a va'lve retainer in 1 the form-ofa loop having pressure applying arms integral with the loop andprojecting across the same, an annularly grooved valve chamber having aIvalve seat,a va1ve disk eooperating with theseat, the p fitting in thegroove and the aforesaidpressure applying arm bearing against the disknear one edge, the other edge being free, the disk be ing of flexiblematerial.

at. A low pressure check valve construction particularly adapted for usewith a bulb or other pump comprising a valve retainer in the form of aloop having pressure applying arms integral with the loop projectingacross the loop, an annularly grooved valve chamber having a valve seat,a valve disk cooperating with the seat, the loop fitting in the grooveand the pressure applying arms bearing against the disk near one edge,the other edge being free and the disk being flexible and the armsserving to limit the opening of the valve.

5. A low pressure check valve particularly adapted for use with a bulbpump comprising a valve retainer in the form of a wire loop having adeflected pressure applying end, a chamber having a valve seat, a valvedisk cooperating with the seat, the wire loop fitting in the chamber andthe pressure member bearing against the disk near the edge, a

tubular fitting, the chamber being formed and the valve mechanismassembled in the fitting which has a threaded portion which surroundsthe chamber and is adapted to cooperate with a threaded opening, thefitting also having a nut-like portion to be engaged by a wrench and atube engaging nipple.

6. In a low pressure check valve construction having a valve chamberwith a valve seat therein, a flexible valve cooperating with the seatand a valve spring comprising a wire loop of a diameter slightly greaterthan the chamber, adapted to be held therein by the tension of thespring, the chamber having suitable abutments to position the loop, theloop having an opening at one side with inwardly projecting resilientarms at each side of the opening, said arms projecting across theloopand being deflected from the plane of the loop so that they bear on thevalve at one edge pressing it against the seat, the other edge beingfree to swing upward in opening the arms serving as a stop to limit theopening of the valve.

Signed by me at Towson, Maryland, this 18 day of March, 1927.

JARED BARTON FLEMING.

